Improvement in sash-balances



C. DIEHL.

. Improvement in nSash-Balances. ,No.132,146.

Patented Oct. 15, 1872 /mf/ wf/ IM/Mullittft. 1 l 1 l c c f7 lz UNITED STATES PATENT CEEIcE.

CHRISTIAN DIEHL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO HIM- SELF AND GOTTLIEB MARTIN BARTH, OF SAME PLAGE.

IMPROVEMENT IN SASH-BALNCES.

Specification forming part of Letters Patent No. 132,146, dated October 15, 1872; antedated October 9, 1872.

To all whom lt may concern:

Be it known that I, CHRISTIAN DIEIIL, of Philadelphia, county of Philadelphia, State of Pennsylvania, have invented an Improvement in Springs for Sash-Balances, 85o., oi' which the following is a specification:

Nature and Objects ofthe Intention.

My invention relates to a sash-balance; and consists of two vertical tubes with external threads adapted to nuts on the sash, and internal strips of rubber, which are twisted on the rotation ofthe tubes by the descent of the sash, the torsion of the rubber strips preventing the tubes from turning by the weight of ent position; and Fig. 3, an enlarged view of part of Fig. 1.

4General Description.

A represents a windowi'rame, and B a sash arranged to slide in the saine in the usual manner. At each side of thesash there is an upright cylinder or tube, I), which turns at its lower end in a plate, n, secured to the window-frame, and at its upper end upon a iXed pin, b, which projects downward from a bracket, b', 0I" the window-frame. Upon the outside of each of these tubes there is a spirally-coiled wire or coarse screw -thread, f, to which is adapted a nut, h, of the sash, so that as the latter is raised the said tubes will be turned Vin one direction, while when it is lowered they will be turned in a contrary direction. The tubes thus turned by the sash serve as mediums for operatin g the balancing springs J J which consist of strips of solid gum-elastic secured at their lower ends tothe rotating tubes and at their upper ends to the fixed pins b upon which the said tubes turn. When the sash is lowered the tubes will be turned in such a direction as to twist the gum springs, and the raising of the sash will turn the tubes in a contrary direction, and will therefore partially untwist the springs. The latter, however, when placed within the tubes, are sufciently twisted to serve, owing to their tendency to recoil, to balance the sash in any position to which it may be raised or lowered. The springs will not, however,r when fully twisted by the lowering ofthe sash, have suflicient power to raise the latter from the sill, they being merely intended as balances.

Claim.

CHRISTIAN DIEHL.

Witnesses z WM. A. STEEL, FRANK B. RICHARDS. 

